import { describe, expect, test } from "vitest";

describe("Config Switching Implementation Test", () => {
  test("ConfigService updateConfigPath method exists with correct signature", async () => {
    const { ConfigService } = await import("../services/ConfigService.js");
    const configService = new ConfigService();

    // Verify the method exists
    expect(configService.updateConfigPath).toBeDefined();
    expect(typeof configService.updateConfigPath).toBe("function");

    // Verify it takes 1 parameter (configPath: string | undefined)
    expect(configService.updateConfigPath.length).toBe(1);
  });

  test("ServiceContainer has required reactive methods", async () => {
    const { serviceContainer } = await import(
      "../services/ServiceContainer.js"
    );

    // Verify service container has all methods needed for reactive updates
    expect(typeof serviceContainer.set).toBe("function");
    expect(typeof serviceContainer.reload).toBe("function");
    expect(typeof serviceContainer.get).toBe("function");

    // These are the methods that enable reactive config switching
  });

  test("SERVICE_NAMES constants exist for config switching", async () => {
    const { SERVICE_NAMES } = await import("../services/types.js");

    // Verify the service names our implementation uses (lowercase)
    expect(SERVICE_NAMES.CONFIG).toBe("config");
    expect(SERVICE_NAMES.MODEL).toBe("model");
    expect(SERVICE_NAMES.MCP).toBe("mcp");
    expect(SERVICE_NAMES.AUTH).toBe("auth");
    expect(SERVICE_NAMES.API_CLIENT).toBe("apiClient");
  });

  test("ConfigService implementation structure is correct", async () => {
    const { ConfigService } = await import("../services/ConfigService.js");

    // Create instance to verify it can be instantiated
    const configService = new ConfigService();

    // Verify it has the required methods for our reactive system
    expect(typeof configService.updateConfigPath).toBe("function");
    expect(typeof configService.getState).toBe("function");
    expect(typeof configService.initialize).toBe("function");

    // The updateConfigPath method is key to reactive config switching
  });

  test("loadConfiguration function exists for configuration loading", async () => {
    const configLoaderModule = await import("../configLoader.js");

    // Verify loadConfiguration function exists and is callable
    expect(typeof configLoaderModule.loadConfiguration).toBe("function");

    // This is what ConfigService.updateConfigPath uses to load new configs
  });

  test("auth functions exist for assistant slug management", async () => {
    const authModule = await import("../auth/workos.js");

    // Verify auth functions exist for assistant slug handling
    expect(typeof authModule.loadAuthConfig).toBe("function");
    expect(typeof authModule.updateAssistantSlug).toBe("function");

    // These are used by ConfigService.updateConfigPath for auth management
  });

  test("expected config switching flow is documented", () => {
    // This test documents the expected behavior:

    const configSwitchingFlow = {
      trigger: "/config command in TUI",
      userAction: "select different configuration",
      codeFlow: [
        "useConfigSelector calls services.config.updateConfigPath(newPath)",
        "ConfigService.updateConfigPath loads new config via loadConfiguration()",
        "ConfigService calls serviceContainer.set(CONFIG, newState)",
        "ConfigService calls serviceContainer.reload(MODEL)",
        "ConfigService calls serviceContainer.reload(MCP)",
        "MODEL service reloads with new model from new config",
        "IntroMessage re-renders via useServices() reactive hook",
        "IntroMessage displays new model name",
      ],
      expectedResult: "IntroMessage shows model from newly selected config",
    };

    // Verify our flow documentation is complete
    expect(configSwitchingFlow.codeFlow).toHaveLength(8);
    expect(configSwitchingFlow.expectedResult).toContain(
      "IntroMessage shows model",
    );

    // The problem we're solving: step 4-5 (serviceContainer.reload calls)
    // are what trigger the reactive updates to make IntroMessage update
  });

  test("real implementation inspection", async () => {
    // This test inspects the actual implementation to verify it does what we expect
    const { ConfigService } = await import("../services/ConfigService.js");

    // Get the source code of updateConfigPath to verify it contains the right calls
    const updateConfigPathSource =
      ConfigService.prototype.updateConfigPath.toString();

    // Verify the implementation contains the key reactive method calls
    expect(updateConfigPathSource).toContain("serviceContainer.set");
    expect(updateConfigPathSource).toContain("serviceContainer.reload");
    expect(updateConfigPathSource).toContain("SERVICE_NAMES.MODEL");
    expect(updateConfigPathSource).toContain("SERVICE_NAMES.MCP");
    expect(updateConfigPathSource).toContain("loadConfiguration");

    // This confirms our implementation has the right structure for reactive updates
    console.log(
      "✅ ConfigService.updateConfigPath implementation contains required reactive calls",
    );
  });
});
